U.S. patent application number 17/258793 was filed with the patent office on 2021-09-02 for method and apparatus for mpdcch performance enhancement.
The applicant listed for this patent is LENOVO (BEIJING) LIMITED. Invention is credited to Haipeng Lei, Hongmei Liu, Haiming Wang, Zhi Yan.
Application Number | 20210273760 17/258793 |
Document ID | / |
Family ID | 1000005629306 |
Filed Date | 2021-09-02 |
United States Patent
Application |
20210273760 |
Kind Code |
A1 |
Yan; Zhi ; et al. |
September 2, 2021 |
METHOD AND APPARATUS FOR MPDCCH PERFORMANCE ENHANCEMENT
Abstract
The present application relates to a method and apparatus for
MPDCCH performance enhancement. One embodiment of the present
disclosure provides an apparatus comprising: a receiver that
receives a first reference signal, a second reference signal and a
control signal; and a processer that decodes the control signal
based on at least one of: the first reference signal and the second
reference signal, wherein the second reference signal on an antenna
port is associated with a precoder, and the antenna port of the
second reference signal and the precoder for the antenna port of
the second reference signal are adopted within a time duration and
a frequency band.
Inventors: |
Yan; Zhi; (Beijing, CN)
; Liu; Hongmei; (Beijing, CN) ; Lei; Haipeng;
(Beijing, CN) ; Wang; Haiming; (Beijing,
CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
LENOVO (BEIJING) LIMITED |
Beijing |
|
CN |
|
|
Family ID: |
1000005629306 |
Appl. No.: |
17/258793 |
Filed: |
July 20, 2018 |
PCT Filed: |
July 20, 2018 |
PCT NO: |
PCT/CN2018/096486 |
371 Date: |
January 8, 2021 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
H04L 5/0048 20130101;
H04W 4/70 20180201; H04W 72/042 20130101; H04W 72/044 20130101 |
International
Class: |
H04L 5/00 20060101
H04L005/00; H04W 72/04 20060101 H04W072/04; H04W 4/70 20060101
H04W004/70 |
Claims
1. An apparatus comprising: a receiver that receives a first
reference signal, a second reference signal and a control signal;
and a processer that decodes the control signal based on at least
one of the first reference signal and the second reference signal,
wherein the second reference signal on an antenna port is
associated with a precoder, and the antenna port of the second
reference signal and the precoder for the antenna port of the
second reference signal are adopted within a time duration and a
frequency band.
2. The apparatus of claim 1, wherein the first reference signal is
a cell-specific reference signal, the second reference signal is a
demodulation reference signal and the control signal is
machine-type communication physical downlink control channel.
3. The apparatus of claim 1, wherein the antenna port of the second
reference signal and the precoder for the antenna port of the
second reference signal within the time duration and the frequency
band are indicated by a higher layer signaling.
4. The apparatus of claim 1, wherein the precoder for the antenna
port of the second reference signal is from a precoder set, and the
precoder set is selected according to a total available antenna
port number of the first reference signal.
5. The apparatus of claim 1, wherein a length of the time duration
is determined by at least one of: a maximal repetition number of
the control signal, a total number of the precoder in a precoder
set, an antenna port number of the second reference signal, a
coverage mode of the control signal, a duplex mode, a cyclic prefix
type and a frequency hopping parameter of the control signal.
6. The apparatus of claim 1, wherein a size of the frequency band
is determined by at least one of a transmission type of the control
signal, a coverage mode of the control signal, and a number of
configured physical resource block-pairs of the control signal.
7. The apparatus of claim 1, wherein a starting subframe for
adoption of the antenna port of the second reference signal and the
precoder for the antenna port of the second reference signal is
determined according to at least one of: a starting subframe of a
search space of the control signal, an absolute radio frame, and an
absolute subframe.
8. The apparatus of claim 1, wherein the receiver further receives
a configuration, the configuration includes at least one of a
precoder set, a size of the frequency band, a length of the time
duration, a starting frequency band, an offset of the frequency
band, a starting time duration, an offset of the time duration, an
initial antenna port, an initial precoder index, an antenna port
adoption order pattern, and a step index of the precoder.
9. The apparatus of claim 1, wherein the precoder for the antenna
port of the second reference signal is selected in a circular order
from a precoder set according to at least one of the time duration,
the frequency band, and the antenna port of the second reference
signal.
10. The apparatus of claim 9, wherein an initial precoder index of
the precoder for the antenna port of the second reference signal is
determined according to at least one of a cell identifier and an
identifier of the apparatus.
11. The apparatus of claim 1, wherein the antenna port of the
second reference signal is selected in a circular order from an
antenna port set according to at least one of the time duration and
the frequency band.
12. The apparatus of claim 11, wherein an initial antenna port of
the second reference signal is determined according to at least one
of a cell identifier and an identifier of the apparatus.
13. An apparatus comprising: a transmitter that transmits a first
reference signal, a second reference signal, and a control signal;
and a processer that pre-processes the second reference signal on
an antenna port using a precoder, wherein the antenna port of the
second reference signal and the precoder for the antenna port of
the second reference signal are adopted within a time duration and
a frequency band.
14. The apparatus of claim 13, wherein the first reference signal
is a cell-specific reference signal, the second reference signal is
a demodulation reference signal and the control signal is
machine-type communication physical downlink control channel.
15. (canceled)
16. The apparatus of claim 13, wherein the precoder for the antenna
port of the second reference signal is from a precoder set, and the
precoder set is selected according to a total available antenna
port number of the first reference signal.
17. (canceled)
18. (canceled)
19. The apparatus of claim 13, wherein a starting subframe for
adoption of the antenna port of the second reference signal and the
precoder for the antenna port of the second reference signal is
determined according to at least one of a starting subframe of a
search space of the control signal, an absolute radio frame, and an
absolute subframe.
20. (canceled)
21. The apparatus of claim 13, wherein the precoder for the antenna
port of the second reference signal is selected in a circular order
from a precoder set according to at least one of the time duration,
the frequency band, and the antenna port of the second reference
signal.
22. (canceled)
23. (canceled)
24. (canceled)
25. A method comprising: receiving a first reference signal, a
second reference signal and a control signal; and decoding the
control signal based on at least one of the first reference signal
and the second reference signal, wherein the second reference
signal on an antenna port is associated with a precoder, and the
antenna port of the second reference signal and the precoder for
the antenna port of the second reference signal are adopted within
a time duration and a frequency band.
26. The method of claim 25, wherein the first reference signal is a
cell-specific reference signal, the second reference signal is a
demodulation reference signal and the control signal is
machine-type communication physical downlink control channel.
27. (canceled)
28. (canceled)
29. (canceled)
30. (canceled)
31. (canceled)
32. The method of claim 25, further comprising: receiving a
configuration, wherein the configuration includes at least one of a
precoder set, a size of the frequency band, a length of the time
duration, a starting frequency band, an offset of the frequency
band, a starting time duration, an offset of the time duration, an
initial antenna port, an initial precoder index, an antenna port
adoption order pattern, and a step index of the precoder.
33. (canceled)
34. (canceled)
35. (canceled)
36. (canceled)
37. (canceled)
38. (canceled)
39. (canceled)
40. (canceled)
41. (canceled)
42. (canceled)
43. (canceled)
44. (canceled)
45. (canceled)
46. (canceled)
47. (canceled)
48. (canceled)
Description
TECHNICAL FIELD
[0001] The present application generally relates to a communication
method and apparatus, especially a communication method and
apparatus for Machine-Type Communication (MTC) physical downlink
control channel (MPDCCH) performance enhancement.
BACKGROUND OF THE INVENTION
[0002] In Rel.13, the Demodulation Reference Signal (DMRS) is used
for decoding MTC Physical Downlink Control Channel (MPDCCH), while
the Cell-Specific Reference Signal (CRS) is not.
[0003] For Rel.13, the demodulation of MPDCCH is based on DMRS as
Enhanced Physical Downlink Control Channel (EPDCCH). In order to
enhance the performance of MPDCCH, combining DMRS with CRS is
proposed to be considered in Rel.16
[0004] In order to improve the performance of MPDCCH, an approach
for combining DMRS with CRS for MPDCCH demodulation is desired.
BRIEF SUMMARY OF THE INVENTION
[0005] One embodiment of the present disclosure provides an
apparatus comprising: a receiver that receives a first reference
signal, a second reference signal and a control signal; and a
processer that decodes the control signal based on at least one of:
the first reference signal and the second reference signal, wherein
the second reference signal on an antenna port is associated with a
precoder, and the antenna port of the second reference signal and
the precoder for the antenna port of the second reference signal
are adopted within a time duration and a frequency band.
[0006] Another embodiment of the present disclosure provides an
apparatus comprising: a transmitter that transmits a first
reference signal, a second reference signal and a control signal;
and a processer that pre-processes the second reference signal on
an antenna port using a precoder, wherein the antenna port of the
second reference signal and the precoder for the antenna port of
the second reference signal are adopted within a time duration and
a frequency band.
[0007] Yet another embodiment of the present disclosure provides a
method comprising: receiving a first reference signal, a second
reference signal and a control signal; and decoding the control
signal based on at least one of: the first reference signal and the
second reference signal, wherein the second reference signal on an
antenna port is associated with a precoder, and the antenna port of
the second reference signal and the precoder for the antenna port
of the second reference signal are adopted within a time duration
and a frequency band.
[0008] Yet another embodiment of the present disclosure provides a
method comprising: transmitting a first reference signal, a second
reference signal and a control signal; and pre-processing the
second reference signal on an antenna port using a precoder,
wherein the antenna port of the second reference signal and the
precoder for the antenna port of the second reference signal are
adopted within a time duration and a frequency band.
BRIEF DESCRIPTION OF THE DRAWINGS
[0009] FIG. 1 illustrates an example block diagram of a wireless
communication system according to an embodiment of the present
disclosure.
[0010] FIG. 2 illustrates an example of joint DMRS-CRS channel
estimation.
[0011] FIG. 3 illustrates another example of joint DMRS-CRS channel
estimation.
[0012] FIG. 4 illustrates an example block diagram of user
equipment according to an embodiment of the present disclosure.
[0013] FIG. 5 illustrates an example block diagram of a base unit
according to an embodiment of the present disclosure.
DETAILED DESCRIPTION OF THE INVENTION
[0014] The detailed description of the appended drawings is
intended as a description of the currently preferred embodiments of
the present invention, and is not intended to represent the only
form in which the present invention may be practiced. It should be
understood that the same or equivalent functions may be
accomplished by different embodiments that are intended to be
encompassed within the spirit and scope of the present
invention.
[0015] Embodiments provide the method and apparatus or MPDCCH
performance enhancement. To facilitate understanding, embodiments
are provided under specific network architecture and new service
scenarios, such as 3GPP 5G, 3GPP LTE Release 8 and onwards. Persons
skilled in the art know well that, with developments of network
architecture and new service scenarios, the embodiments in the
subject disclosure are also applicable to similar technical
problems.
[0016] FIG. 1 depicts a wireless communication system 100 according
to an embodiment of the present disclosure.
[0017] As shown in FIG. 1, the wireless communication system 100
includes user equipment 101 and base units 102. Even though a
specific number of user equipment 101 and base units 102 are
depicted in FIG. 1, one of skill in the art will recognize that any
number of user equipment 101 and base units 102 may be included in
the wireless communication system 100.
[0018] The user equipment 101 may include computing devices, such
as desktop computers, laptop computers, personal digital assistants
(PDAs), tablet computers, smart televisions (e.g., televisions
connected to the Internet), set-top boxes, game consoles, security
systems (including security cameras), vehicle on-board computers,
network devices (e.g., routers, switches, modems), or the like.
According to an embodiment of the present disclosure, the user
equipment 101 may include a portable wireless communication device,
a smart phone, a cellular telephone, a flip phone, a device having
a subscriber identity module, a personal computer, a selective call
receiver, or any other device that is capable of sending and
receiving communication signals on a wireless network. In some
embodiments, the user equipment 101 includes wearable devices, such
as smart watches, fitness bands, optical head-mounted displays, or
the like. Moreover, the user equipment 101 may be referred to as
subscriber units, mobiles, mobile stations, users, terminals,
mobile terminals, wireless terminals, fixed terminals, subscriber
stations, user equipment 101, user terminals, a device, or by other
terminology used in the art. The user equipment 101 may communicate
directly with a base unit 102 via uplink (UL) communication
signals.
[0019] The base units 102 may be distributed over a geographic
region. In certain embodiments, a base unit 102 may also be
referred to as an access point, an access terminal, a base, a base
station, a macro cell, a Node-B, an enhanced Node B (eNB), a base
units 102, a Home Node-B, a relay node, a device, or by any other
terminology used in the art. The base units 102 are generally part
of a radio access network that may include one or more controllers
communicably coupled to one or more corresponding base units
102.
[0020] The wireless communication system 100 is compliant with any
type of network that is capable of sending and receiving wireless
communication signals. For example, the wireless communication
system 100 is compliant with a wireless communication network, a
cellular telephone network, a Time Division Multiple Access
(TDMA)-based network, a Code Division Multiple Access (CDMA)-based
network, an Orthogonal Frequency Division Multiple Access
(OFDMA)-based network, a Long Term Evolution (LTE) network, a 3rd
Generation Partnership Project (3GPP)-based network, 3GPP 5G
network, a satellite communications network, a high altitude
platform network, and/or other communications networks.
[0021] In one implementation, the wireless communication system 100
is compliant with the long-term evolution (LTE) of the 3GPP
protocol, wherein the base unit 102 transmits using an orthogonal
frequency division multiplexing (OFDM) modulation scheme on the DL
and the user equipment 101 transmit on the UL using a
single-carrier frequency division multiple access (SC-FDMA) scheme
or OFDM scheme. More generally, however, the wireless communication
system 100 may implement some other open or proprietary
communication protocol, for example, WiMAX, among other
protocols.
[0022] In other embodiments, the base unit 102 may communicate
using other communication protocols, such as the IEEE 802.11 family
of wireless communication protocols. Further, in some embodiments
the base unit 102 may communicate over licensed spectrum, while in
other embodiments the base unit 102 may communicate over unlicensed
spectrum. The present disclosure is not intended to be limited to
the implementation of any particular wireless communication system
architecture or protocol. In another embodiment, the base unit 102
may communicate with user equipment 101 using the 3GPP 5G
protocols.
[0023] The subject application presents an approach for MPDCCH
performance enhancement. The base station pre-processes the DMRS of
an antenna port and MPDCCH based on a precoder, and transmits the
CRS, pre-processed DMRS and MPDCCH to UE. After receiving these
signals, UE decodes the MPDCCH based on the CRS and pre-processed
DMRS. The antenna port of DMRS and the precoder is adopted within a
time duration and a frequency band.
[0024] The precoder indicates a relationship between the CRS
antenna port and DMRS antenna port since the CRS is not
pre-processed with the precoder. By combining CRS and DMRS with
precoders at the UE side, an improved channel estimation can be
achieved. Thus, for enhancing the joint DMRS-CRS channel
estimation, at least the following items should be determined at
the UE side: a frequency band, a time duration and an antenna port
for transmitting the MPDCCH, and a precoder associated with the
time duration, the frequency band and the antenna port. These items
may be indicated by higher layer signalling, implicitly derived
from higher layer signaling configured parameters or fixed in
specification.
[0025] FIG. 2 depicts a precoder arrangement in time-frequency
domain for joint DMRS-CRS channel estimation. In this embodiment,
higher layer signalling indicates an antenna port of DMRS and a
precoder for the antenna port of DMRS within a time duration and a
frequency band.
[0026] As shown in FIG. 2, the horizontal axis represents the time
domain, and the vertical axis represents the frequency domain. The
length of time duration, which is denoted by "X," is 5 ms, the size
of frequency band, which is denoted by "Y," is 3 Physical Resource
Block (PRB), the precoder set is denoted as W={w0, w1, . . . w15},
and the antenna port set is denoted as P={P107, P108, P 109, and
P110}. The preocoder set W adopted for DMRS and MPDCCH may be
determined by the total available antenna port number of CRS. For
example, if the available antenna port number of CRS is 2, the
precoder set in Table 6.3.4.2.3-1 of Evolved Universal Terrestrial
Radio Access (E-UTRA); Physical channels and modulation (3GPP
TS36.211) is utilized, where the element of each precoder is a
2.times.1 complex vector; and if the available port number of CRS
is 4, the preocoder set in Table 6.3.4.2.3-2 of 3GPP TS36.211 is
utilized, where the element of each precoder is a 4.times.1 complex
vector. In FIG. 2, the precoder set W is selected from Table
6.3.4.2.3-2 of 3GPP TS36.211.
[0027] As shown in FIG. 2, the higher layer signalling indicates
that in time duration from 0 to 5 and frequency band from PRB0 to
PRB2, the antenna port P107 associated with precoder w0 are adopted
by DMRS and the MPDCCH, the other antenna port P109 associated with
precoder w7 are adopted by DMRS and the MPDCCH; and the in time
duration from 10 to 15 and frequency band from PRB3 to PRB5, and
the antenna port P108 associated with the precoder w10 are adopted
by DMRS and the MPDCCH or antenna port 110 is associated with
precoder w14 are adopted by DMRS and MPDCCH. For example, w0 w7,
w10 and w14 are selected from the second column in Table
6.3.4.2.3-2 of 3GPP TS36.211, where the second column suggests the
number of layers is 2.
[0028] In other embodiments, the preocoder set W may also be
determined by higher layer signaling or fixed in specification.
[0029] FIG. 3 depicts another example of precoder arrangement in
time-frequency domain for joint DMRS-CRS channel estimation.
[0030] The length of time duration X may be derived from the
existing higher layer parameters, or fixed in the specification
rather than indicated by the higher layer signaling as shown in
FIG. 2. As shown in FIG. 3, the length of time duration X may be
from T0 to T1 or from T1 to T2. For example, T0 may be 0, T1 may be
5 ms, and T2 may be 10 ms.
[0031] In one preferred embodiment, the length of time duration X
can be determined by the MPDCCH search space of Rmax, which is a
maximal repetition number of the MPDCCH. For example, the value of
X may be floor (Rmax/N), where floor ( ) is the lower rounding
function, and N is the total number of precoders in the precoder
set. Assuming that higher layer signalling configures Rmax is 128
and N is 16 (CRS antenna port is 0, 1, 2, or 3), the length of time
duration is X=128/16=8.
[0032] In another preferred embodiment, the length of time duration
X may be determined by Coverage Enhancement (CE) mode of MPDCCH and
duplex mode of Frequency Division Duplex (FDD) and Time Division
Duplex (TDD). For example, as shown in Table 1, if the CE mode is A
and the duplex mode is FDD, the length of time duration X may be 1,
2, 4, or 8 and higher layer signalling indicates the X from {1, 2,
4, 8}; if the CE mode is B and the duplex mode is TDD, the length
of time duration X may be 5, 10, 20, or 40 and higher layer
signalling indicates the X from {5, 10, 20, 40}.
TABLE-US-00001 TABLE 1 the value of the length of time duration X
CE Mode FDD TDD A 1, 2, 4, or 8 1, 5, 10, or 20 B 2, 4, 8, or 16 5,
10, 20, or 40
[0033] In yet another preferred embodiment, the length of time
duration X may also be determined by a scaling factor configured by
higher layer signaling and/or
interval-DLHoppingConfigCommonModeA/B-r13. If the scaling factor is
1 and the configured interval-DLHoppingConfigCommonModeA/B-r13 is 5
ms by higher layer signalling, the length of time duration is
interval-DLHoppingConfigCommonModeA/B-r13 multiplied by the scaling
factor, which is 5 ms.times.15 ms. For example, for FDD, the
scaling factor indicated by higher layer signalling from a scaling
factor set, for example the scaling factor set can be {1, 2, 4,
8}.
[0034] In another preferred embodiment, the length of time duration
X may also be determined by the antenna port number of the DMRS or
a cyclic prefix type.
[0035] The size of frequency band Y (i.e., the PRB bundling size)
can be indicated by the higher layer signaling, derived from the
existing higher layer parameters, or fixed in the specification.
The size of frequency band Y may be from F0 to F1, or from F1 to
F2. For example, F0 may be 0, F1 may be 180.times.3 KHz
(corresponding to frequency domain size of 3PRB) and F2 may be
180.times.6 KHz (corresponding to frequency domain size of
6PRB).
[0036] For example, in table 2, the value of the PRB bundling size
can be "P1," "P2," "Q1," "Q2," "R1," or "R2," which are determined
by higher layer signaling.
TABLE-US-00002 TABLE 2 the value of the PRB bundling size Y
Localized MPDCCH numberPRB-Pairs CE mode A CE mode B 2 P1 P2 4 Q1
Q2 6 R1 R2
[0037] In another preferred embodiment, the PRB bundling size is
determined by the number of available PRB pairs (i.e.,
numberPRB-Pairs), CE Mode, and transmission type of MPDCCH (i.e.,
localized or distributed). For example, if the number of available
PRB pairs configured by higher layer signalling is 2, the
transmission type of MPDCCH is configured as localized transmission
mode, and the CE mode is A, it is determined that the value of the
PRB bundling size is 1 according to Table 3.
TABLE-US-00003 TABLE 3 the value of the PRB bundling size Y
numberPRB- Localized MPDCCH Distributed MPDCCH Pairs CE mode A CE
mode B CE mode A CE mode B 2 1 2 1 2 4 2 4 2 4 6 3 6 3 6
[0038] The starting subframe for adoption of the antenna port of
DMRS and the precoder for the antenna port of DMRS may be
determined according to a starting subframe of a search space of
MPDCCH, an absolute radio frame, or an absolute subframe.
[0039] The starting subframe may also be determined by the search
space of MPDCCH. For common search space, the starting subframe is
cell-specific, and The starting subframe for adoption of the
antenna port of DMRS and the precoder for the antenna port of DMRS
is the same as the starting subframe of the common search
space.
[0040] For example, if the starting subframe is cell-specific, the
starting subframe is related to the absolute subframe (e.g.,
determined by System Frame Number (SFN) and subframe number).
[0041] The starting precoder index for adoption of the antenna port
of DMRS may relates to the cell ID, and the circular order is
determined by circular selection from the precoder set. For
example, for time domain, the precoder index is determined by the
following equation:
j(j+M1)% N;
where j is the index of precoder set, M1 is the step size
configured by higher layer signalling or fixed in specification, N
is the number of precoder in the precoder set.
[0042] For UE-specific search space, the starting subframe of
precoder adoption is UE-specific. For example, the starting
subframe of precoder adoption may begin with the starting subframe
of UE-specific search space, and the starting precoder index
relates to the UE ID.
[0043] The antenna port of DMRS may be circularly selected from an
antenna port set P{P107, P108, P109, P110}. For example, it can be
selected from the antenna port set P according to at least one of:
the time duration X, the frequency band Y, and the antenna port of
DMRS.
[0044] The precoder for the antenna port of DMRS may be circularly
selected from a precoder set W {w0, w1, . . . , w15}. For example,
it can be selected from the precoder set W according to at least
one of: the time duration X, the frequency band Y, and the antenna
port of DMRS.
[0045] The initial precoder index of the precoder for the antenna
port of DMRS may be determined according to the cell ID or the UE
ID. For example, in time duration from 0 to 5 and frequency band
from PRB0 to PRB2, for antenna port P107, the initial precoder
index is cell ID % N, and for antenna port P109, the initial
precoder index is: (cell ID+M1) % N, where M1 may be fixed to 4 or
higher layer signalling configured, and N is the total number
precoder in the precoder set.
[0046] The antenna port of DMRS may be circularly selected from an
antenna port set according to the time duration or the frequency
band, and an initial antenna port of DMRS may be determined
according to a cell ID or UE ID. The circular order may be
configured by higher layer signaling or fixed in the
specification.
[0047] Take the embodiment in FIG. 3 as an example. For the same
frequency band (e.g., F0 to F1) and the same antenna port (e.g.,
P107), the index of precoder in different time duration is:
(cell ID+M2)% N
where M2 is the time step, N is the total number of precoder set.
In this case, in time domain from T0 to T1, the precoder index is
0; in time domain from T1 to T2, the precoder index is: (0+1) %
16=1; in the time domain from T2 to T3, the precoder index is (0+2)
% 16=2. That is, for the same frequency band (e.g., from F0 to F1)
and the same antenna port (e.g., P107), the precoder is w0 in the
time duration from T0 to T1; the precoder is w1 in the time
duration from T1 to T2; and the precoder is w2 in the time duration
from T2 to T3.
[0048] In another preferred embodiment, the base unit may transmit
a configuration to the UE, and the configuration may include a
precoder set W, a size of the frequency band Y, a length of the
time duration X, a starting frequency band, an offset of the
frequency band, a starting time duration, an offset of the time
duration, an initial antenna port, an initial precoder index, an
antenna port adoption order pattern, or a step index of the
precoder.
[0049] FIG. 4 depicts a block diagram of user equipment according
to the embodiments of the present disclosure. The user equipment
101 may include a receiver and a processor. In certain embodiments,
the user equipment 101 may further include an input device, a
display, a memory, and/or other elements. In one embodiment, the
receiver receives CRS, DMRS and MPDCCH, and the processor decodes
MPDCCH based on at least one of: CRS, DMRS, wherein DMRS
transmitted on an antenna port is associated with a precoder, and
the antenna port of DMRS and the precoder for the antenna port of
DMRS are adopted within a time duration and a frequency band. The
functions and implementations of all elements in the user equipment
101 and definitions of related technical terms can refer to the
specific descriptions of FIGS. 2 and 3 and the foregoing
corresponding paragraphs in this specification.
[0050] FIG. 5 depicts a block diagram of a base unit according to
the embodiments of the present disclosure. The base unit 102 may
include a transmitter and a processor. In certain embodiments, the
base unit 102 may further include an input device, a display, a
memory, and/or other elements. In one embodiment, a transmitter
transmits CRS, DMRS and MPDCCH, and the processor pre-processes the
DMRS using a precoder, and the antenna port of DMRS and the
precoder for the antenna port of DMRS are adopted within a time
duration and a frequency band. The functions and implementations of
all elements in the apparatus and definitions of related technical
terms can refer to the specific descriptions of FIGS. 2 and 3 and
the foregoing corresponding paragraphs in this specification.
[0051] The method of this disclosure can be implemented on a
programmed processor. However, the controllers, flowcharts, and
modules may also be implemented on a general purpose or special
purpose computer, a programmed microprocessor or microcontroller
and peripheral integrated circuit elements, an integrated circuit,
a hardware electronic or logic circuit such as a discrete element
circuit, a programmable logic device, or the like. In general, any
device on which there resides a finite state machine capable of
implementing the flowcharts shown in the figures may be used to
implement the processor functions of this disclosure.
[0052] While this disclosure has been described with specific
embodiments thereof, it is evident that many alternatives,
modifications, and variations will be apparent to those skilled in
the art. For example, various components of the embodiments may be
interchanged, added, or substituted in the other embodiments. Also,
all of the elements of each figure are not necessary for operation
of the disclosed embodiments. For example, one of ordinary skill in
the art of the disclosed embodiments would be capable of making and
using the teachings of the present disclosure by simply employing
the elements of the independent claims. Accordingly, the
embodiments of the present disclosure as set forth herein are
intended to be illustrative, not limiting. Various changes may be
made without departing from the spirit and scope of the present
disclosure.
[0053] In this document, relational terms such as "first,"
"second," and the like may be used solely to distinguish one entity
or action from another entity or action without necessarily
requiring or implying any actual such relationship or order between
such entities or actions. The terms "comprises," "comprising," or
any other variation thereof, are intended to cover a non-exclusive
inclusion, such that a process, method, article, or apparatus that
comprises a list of elements does not include only those elements
but may include other elements not expressly listed or inherent to
such process, method, article, or apparatus. An element proceeded
by "a," "an," or the like does not, without more constraints,
preclude the existence of additional identical elements in the
process, method, article, or apparatus that comprises the element.
Also, the term "another" is defined as at least a second or more.
The terms "including," "having," and the like, as used herein, are
defined as "comprising."
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